If shaking continues and the above treatments do not resolve the issue, there are other less common medical issues to consider:
Generalized Tremor Syndrome -
This is also called white shaker dog syndrome, since at one time it was only seen in pure white dogs. While this is now seen in dogs of all coat colors, though it is still more common with dogs of a light color color. This would include apricot, cream and beige Poodles among others. With this condition, the only symptom is full body shaking. Even so, it can be mistaken for other issues such as hypoglycemia or being chilled as mentioned above.
While a Poodle of any age can develop this, it most often strikes those between 9 months old and 2 years old. While the cause is unknown, it responds very well to prednisone treatment with improvement often seen within one week.
A range of diseases from distemper to liver disease can cause shaking. It should be noted that there will be a wide array of other symptoms including: changes in weight, changes in appetite, coughing, wheezing, weakness, fever, eye or nasal discharge, excessive sleeping, restlessness and many more. Chronic shaking that is not resolved by the above remedies of keeping the Poodle warm, treating for possible low blood sugar and limiting stress OR that is accompanied by any signs that may point to a health problem
, disease or illness should be treated by a reputable veterinarian ASAP.
While shaking is sometimes a symptom of seizures, there are very specific signs, depending on the severity of the seizure. The most common cause of seizures in dogs is idiopathic epilepsy. This usually has 3 distinct phases: Pre-ictal phase (includes whining, shaking, drooling and/or restlessness), Ictal phase (can be minor with blank staring or severe with full body spasms) and Post-ictal phase (includes confusion, pacing, vision problems and/or drooling)
Diagnosis includes ruling out poisoning, head trauma, liver disease, kidney disease and heart issues including heartworms. Spinal fluid may be check and CAT scans or MRI performed. This is treated with anticonvulsant medications; the most common being phenobarbital and potassium bromide.